Typewriter



c. D. YOUNGBERG 1,809,883

TYPEWRITER June 161931.

Filed Jan. 2l 1925 Patented June 16, 1931 UNITE-D STATESPATENT OFFICE CONRAD I). YOUNGBERG, OFWOODSTOCK, ILLINOIS, ASSIGNOR TO WOODSTOCK 'JIYIPE- WRITER OOHPANY, Ol' WOODSTOCK, ILLINOIS, A. CORPORATION OF ILLINOIS TYPEWRITEB Applicaties aies January 2, 1925. serial 1m29.

This invention relates to the type bar action of typewriter mechanism, and has for its.

object the provision of means for actuating the type bars which shall be of improved construction and o ration and in which the noise' incident to t eir operation shall be reduced to a minimum.

The invention is exemplified in the combination and arrangement of parts shown in the accompanying drawing and described in the following specification, and it is more particularly lpointed out in the appended invention is applicable to other forms of typewriting machines.

The numeral 1 designates a typewriter frame having a motor actuated roller 2 jour- `naled therein and driven by any suitable source of power. Key levers 3 are pivotally mounted at 4. The type bars 5 are pivoted at 6 on any well-known form of type bar support and are arranged toenage a platen 7. he type bars are actuated y sub-levers 8 pivoted at 9 on a cross-bar 10, the sub-levers being connected by pivots 11 to actuators 12. The actuators 12 are provided with teeth 13 in position to engage the teeth on the power rollers 2, the actuator being held out of engagement with the power roller by springs 14. The key levers 3 are provided with contact members 15 by means of which the actuators 12 are de ressed to engage the rollers 2. This will produce movement of the sub-levers 8 and the ty e bars 5. The power for actuating the type'gars is furnished from the power roller 2 and it is only necessary to exert sufcient lforce on the key levers 3 to move the actuator corre ending to the particular key lever de resse into engagement with the drive ro er.

In front of the sub-levers 8 there is a bar aluminum or any suitable material.

16 which extends across the typewriter frame and 1s provided with a plurality of plungers 17 slidably mounted in flanges 18 on the bar 16. One plunger 17 is provided for each sub-lever. The plungers 17 are provided with forwardlyy extending guide rods or screws 19 which are'threaded into openings 20 in the plungers 17 and are provided with lock nuts 21 to hold them in ad'usted positions relative'to the plungers. prings' 22 are interposed between the lock nuts 21 and the front iange 18 to resiliently hold the plungers 17 rearwardly in the path of movement of the sub-levers 8.

When the key lever 3 is depressed to cause the power drive 2 to actuate the ty e bar, the sub-lever 8 will move from the ull to the broken line position, as shown in the ligure. This will actuate the plunger 17 to compress the spring 12 bringing the type bar to rest with just suliicient impact to make an impression u on the paper. The noise of the impact wil thus be practically eliminated.

The screw 19 and lock nut 2l may be adjusted to regulate the resistance of the spring 22 so as to produce the proper impact of the type. The stop member 17 being 'located adjacent the pivot of the spring will cause less noise upon\ contact with the sub-lever than would be the case if the parts were arrestedat a .point where the movement is greater. The location of the stop also makes it possible to enclose the parts in a sound retaining casing 23 which preferabllyq7 comprises ala er 24 o fibrous material, suc

as felt, and a ayer 25 of inert metal, such as h lead. An outer supporting and stiii'ening plate 26 may be provided, which may be I claim l 1. In a ty ewriter, the combination with a type bar, o actuating means therefor, comprising a pivoted sub-lever, a power roller,

an actuator connected to said sub-lever, a key lever, means for connecting said actuator to saidpower roller to secure operation of said actuating means, and a spring-pressed plunger mounted in position to be engaged y said sub-lever when said type bar approaches its platen striking position.

2. In a writer, the combination with a type bar, o actuatin 'means therefor coma pivoted subever adapted to swing tow the keyboard when operated, a ower s roller, an actuator connected to sai sublever, means for connecting said actuator to said power roller to secure operation of said actuatin means, and as ring-pressed plunger spac from said subever when the latter m is inactive but mounted in postion'to be en- A gaged thereby above its pivot vwhen said type ar is approaching platen striking position. 3. The combination with a typewriter comprising atype bar and power-operated u actuating means therefor comprising a pivoted lever connected to the type bar, of a plunger individual to said lever, means for supporting said plunger for reciprocation forwardl and rearwardly but out of contact m with sai lever when the latter is inactive and in position to be en aged thereby when said type bar is approac ing platen striking position, a cushioning spring acting on sai plunger urging the same rearwardly toward u said lever an adapted to be compressed when saidI plunger 1s moved forwardly by being enga by said lever2 and means for adjusting t e position-of said plunger relative to said lever to adjust the cushioning ef- 30 fect relative to the approach of the type bar to laten striking osition.

n testimony w ereof I have signed my name to thiss ification on this 30th day of December,-A. 1924.

as l CONRAD D. YOUNGBERG. 

